Basically, what’s a yoyo that’s indestructible? what yoyos have you tried that won’t break no matter what happens?
Realistically, probably a monometal titanium with Ti side effects.
Can tank a hit, wont strip the threads and shouldn’t “break”. Depends on what you are putting the sucker through?
Dont give it the terminator treatment and it should be good. 
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Proyonium
I hear the Survivalist by Spinworthy is very tough. @Glenacius_K has some examples, I’m sure.
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any with side effects 
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Got a Henry’s Viper with Cobra wings from the 90s and it’s flown off and hit all sorts of things many times. A quarter century later it’s still fine.
So perhaps non-intuitively, not a metal/alloy very hard with high yield, impact resistance, hardness, etc… The hub certainly with regards to axle threading, but with wings/rims that inherently deform on impact as a crumple zone. Duncan First Yo! would be another example, though the hub is plastic and can be over-tightened. Viper Remix and Rewind Newt as well. Freshly Dirty Mod44 with silicone wings (might be able to cast it).
A theoretical most durable yoyo though…
For a hub perhaps something like maraging steel (350) with heat aging to increase hardness purely to resist thread stripping.
Or bypass the issue entirely with a bolt and nut(s). The bolt would then require high fracturing resistance. That would be maraging steel. The hub or body could then be a titanium alloy to reduce weight since the bolt and nuts would be heavy.
So basically a bolt and nut made of aged maraging steel, hub made of titanium, and wings made of TPU.
54 gen 2 has thick walls and side effects. mine has taken some hits with no noticeable difference in play. also I’ve been playing one of my forma 5a and i sent it rolling into a brick wall 5 times before i was smart enough to move where i was standing and it didn’t even ding, just anno marks. haven’t drilled concrete with it yet but i imagine based on it so far that it will take the hit like a champ
Forma wouldn’t be the first durable Edition:
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He ran over it with his truck and it still worked. This is probably actually the most durable yoyo.
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My crucial milk has been bonked a billion times and still is somehow smooth
Haha glad to hear its handling being bumped into things!
I test all our releases for bump/ding durability prior to release. It’s big for us to have releases which last the test of time, mechanically, visually and play wise.